Position Control – FX Series

The combination of FX3U and SSCNET III is the right solution for cost effective, high speed and high precision positioning. Reduced setup times and increased control distances for positioning operations enable a wide range of applications to be realized. Advanced control is possible with real-time monitoring of the servo amplifier and with new positioning commands.

SSC-Net

Smooth, high-speed, high accuracy operations are now attainable with the new generation SSCNET III synchronous communication network. Cabling setup time is reduced with direct, plug-and-play connectivity to servo equipment.

Additionally, fiber optic wiring enhances data transfer reliability, improves noise resistance and simplifies wiring diagrams. Smooth control with high speed serial communication cycle times up to 1.7 ms improve positioning accuracy.

Easy Programming

Servo parameters and positioning informations are easily set up with an FX3U PLC and FX Configurator-FP. This user-friendly software package makes it easy to setup a table of operational information, servo amplifier parameters and positioning parameters for the FX3U-20SSC-H. Positioning operations can be monitored and tested and a clearly arranged table operation feature reduces program development time.

With the high resolution encoder on the MR-J3 servo motor, pulses may be counted for rates up to 262144 pulses/rev. Performance is enhanced giving more stable control in low speed regions where precision is a must.

2 Axes for advanced operation control

High precision control of 2 axes with synchronous capability via SSCNET III optical wiring is available.

The operation speed and target position can change during positioning for more flexibility in positioning applications.

• Variable speed operation
  • Operation speeds change to user-specified speeds according to arbitrary timing intervals.
• Override function
  • To change the operation speed at an arbitrary timing during positioning, the override function may be used for amplifying the signal from 0.1 % to 3000 %.
• Target address change
  • The target address may be changed to a newlocation during positioning operation.

3 settings for zero return method

Various modes are available for setting a workpiece’s mechanical zero return method including Dog type zero return, Data-type zero return and Stopper type zero return.

• Dog type zero return
  • When a workpiece stops with a DOG type mechanical zero return, the zero-point position is set.
• Stopper type mechanical zero return
  • workpiece stops at the stopper position according to the zero return torque limit value and a new zero-point is defined.
• Data-set type zero return
  • For operations without a mechanical zero-point or DOG return, the Data-set type zero return procedure is convenient for setting the zero-point of a workpiece.

Wide ranging application

The combination of FX3U, SSCNET III and MR-J3 servos allows easy solutions to complex problems. For example, torque limiting can be easily set-up and controlled through a simple PLC program. This can then be used to manage performance, such as when a servo motor drives up to a mechanical stop. The torque increase will vary depending upon the load conditions, and so this limit can be simply tuned within the PLC program.

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